uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/development/python-modules/kaptan/default.nix

@@ -0,0 +1,34 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, pyyaml
+, pytest
+}:
+
+buildPythonPackage rec {
+  pname = "kaptan";
+  version = "0.5.12";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1abd1f56731422fce5af1acc28801677a51e56f5d3c3e8636db761ed143c3dd2";
+  };
+
+  postPatch = ''
+    sed -i "s/==.*//g" requirements/test.txt
+
+    substituteInPlace requirements/base.txt --replace 'PyYAML>=3.13,<6' 'PyYAML>=3.13'
+  '';
+
+  propagatedBuildInputs = [ pyyaml ];
+
+  checkInputs = [ pytest ];
+
+  meta = with lib; {
+    description = "Configuration manager for python applications";
+    homepage = "https://kaptan.readthedocs.io/";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ ];
+  };
+
+}